JP4043752B2 - Light emitting diode lamp and lighting apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light-emitting diode lamp and a lighting fixture using the same.
[0002]
[Prior art]
For example, low-pressure sodium lamps and dual-wavelength fluorescent lamps are used for lighting in roads and tunnels. Low-pressure sodium lamps are often used because they have the highest lamp efficiency among artificial light sources. The dual-wavelength fluorescent lamp has two fluorescent lamps, a green fluorescent lamp and a red fluorescent lamp, in order to obtain lamp efficiency similar to that of a low-pressure sodium lamp. High pressure sodium lamps are also used.
[0003]
[Problems to be solved by the invention]
However, the low-pressure sodium lamp has a problem in that the emitted light is inferior in color discrimination due to an orange single color having a wavelength of 589 nm. In addition, the dual-wavelength fluorescent lamp has a problem that it cannot be used in streetlights, food-related storefronts, and workplaces because it has an irradiating property that attracts insects such as moths because of its emission wavelength in the ultraviolet to blue range. . Insects are not only attracting many insects, but they also lay eggs and generate a larger amount. Furthermore, the high-pressure sodium lamp has excellent color discrimination, but has a problem that the lamp efficiency is lowered and a problem that it takes time to relight the lamp once it is turned off.
[0004]
The present invention has been made in view of the above circumstances, and provides a light-emitting diode lamp that is excellent in color discrimination, does not have insect attracting properties, and can be turned on immediately, and a lighting apparatus using the same. The purpose is that.
[0005]
[Means for Solving the Problems]
A light emitting diode lamp according to the present invention includes a light emitting diode chip that emits green light, and a red phosphor that emits fluorescence having a wavelength of about 580 to 620 nm in response to light from the light emitting diode chip. The phosphors are Y ₃ (Al, Ga) ₅ O ₁₂ : Eu, Y ₂ O: Eu, Y ₂ O ₃ : Eu, Y (Al, Ga) O ₃ : Eu, (Y, La) ₂ O ₃ : At least one of Eu is selected so as not to emit light having a wavelength of 300 nm to 400 nm or light having a wavelength of 480 nm to 520 nm.
[0006]
Moreover, the lighting fixture which concerns on this invention uses the light emitting diode lamp mentioned above.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic sectional view showing a configuration of a light emitting diode lamp according to an embodiment of the present invention, and FIG. 2 is a spectrum diagram showing an excitation spectrum of a red phosphor used in the light emitting diode lamp according to the embodiment of the present invention. FIG. 3 is a spectrum diagram showing the emission spectrum of the red phosphor used in the light emitting diode lamp according to the embodiment of the present invention, and FIG. 4 is a schematic diagram showing the configuration of the light emitting diode lamp according to another embodiment of the present invention. FIG. 5 is a schematic sectional view of a lighting apparatus according to an embodiment of the present invention.
[0008]
The light-emitting diode lamp A according to the embodiment of the present invention includes a light-emitting diode chip 100A that emits green light L1 and a red phosphor 210A that emits red fluorescence L2 when receiving the green light L1 from the light-emitting diode chip 100A. The red phosphor 210A uses Y ₂ O ₃ : Eu.
[0009]
Since the light emitting diode chip 100A has a light emission wavelength of 530 nm, it emits green light L1.
[0010]
The light emitting diode chip 100A is die-bonded to a cup portion 411A of a lead frame 400A having a die bonding lead 410A provided with a cup portion 411A and a wire bonding lead 420A, and is attached to the wire bonding lead 420A by a thin wire 430A such as a gold wire. Wire bonded.
[0011]
The light emitting diode chip 100A is molded with a mold resin 300A which is a transparent epoxy resin. In the mold resin 300A, the red phosphor 210A is mixed.
[0012]
When receiving the green light L1 of 530 nm, the red phosphor 210A emits red fluorescence L2 having a wavelength of 580 to 620 nm (mainly 590 nm). The red phosphor 210A is obtained by sintering a mixture of Y ₂ O ₃ , Al ₂ O ₃ , Ga ₂ O ₃ , Eu ₂ O ₃ at 1600 ° C. for 3 hours and then washing. is there. Specifically, the red phosphor 210A is manufactured as follows. First, the raw material Y ₂ O ₃ and Eu ₂ O ₃ mixed at a stoichiometric ratio such that Y: Eu = 0.8: 0.2 is dried at 100 ° C. Thereafter, the product sintered at 1600 degrees for 3 hours in a crucible is dried and classified after several washing treatments. The excitation spectrum of Y ₂ O ₃ : Eu is as shown in FIG. 2, and the emission spectrum is as shown in FIG.
[0013]
Therefore, the light emitted from the light emitting diode lamp A can be arbitrarily adjusted between green, yellow and red depending on the amount of the red phosphor 210A. The colors used as road signs are six colors of green, yellow, red, blue, white and orange, and the light emitted from the light-emitting diode lamp A is excellent in color discrimination of these colors. .
[0014]
Further, as the red phosphor 210A, in addition to Y ₂ O ₃ : Eu, Y ₃ (Al, Ga) ₅ O ₁₂ : Eu, Y ₂ O ₂ S: Eu, YAlO ₃ : Eu, Y (Al, Ga) O ₃ : Eu, (Y, La) ₂ O ₃ : Eu.
[0015]
A red phosphor _{210A Y 2 O 2 S: Eu} , YAlO 3: Eu, Y (Al, Ga) O 3: Eu, (Y, La) 2 O 3: Eu production method for the.
[0016]
In the embodiment described above, the red phosphor 210A is mixed with the mold resin 300A. However, as shown in FIG. 4A, the red phosphor 210A is applied to the surface of the light emitting diode chip 100A. Alternatively, as shown in FIG. 4B, it is also possible to apply the red phosphor 210A to the surface of the mold resin 300A.
[0017]
Further, as shown in FIG. 4C, a filter 500A coated with the red phosphor 210A can be installed at a position in the mold resin 300A that receives the green light L1 from the light emitting diode chip 100A. is there. Furthermore, as shown in FIG. 4D, it is possible to apply a red phosphor 210A to the cup portion 411A.
[0018]
Further, as shown in FIG. 4E, the mold resin 300A has a double structure, the red phosphor 210A is mixed only in the mold resin 310A for directly molding the light emitting diode chip 100A, and the mold resin 310A is molded. The resin 320A may be a normal epoxy resin.
[0019]
A description will be given of a lighting fixture B in which a plurality of light-emitting diode lamps A configured as described above are arranged and housed in a housing 500B. In this lighting fixture B, the light-emitting diode lamps A are arranged in a matrix on a single substrate 510B. As the housing 500B, there are a type attached to the tip of a pole 520B as shown in FIG. 5A and a type attached directly to a tunnel wall or the like as shown in FIG. 5B.
[0020]
Since this lighting fixture B uses the light-emitting diode lamp A as a light source, a ballast is not required, so that it is about 5 to 8 kg lighter than a conventional low-pressure sodium lamp or the like. Moreover, the effect of the instant lighting which is the characteristic of the light emitting diode lamp A can also be expected.
[0021]
In addition, many insects such as squid are sensitive to wavelengths of 300 nm to 400 nm. In particular, it is said that 365 nm is a sensitive peak, and there is a small peak around 480 nm to 520 nm. The light emitting diode lamp A emits light having a wavelength of 530 nm green light L1 from the light emitting diode chip 100A and red fluorescent light L2 of 580 to 620 nm (mainly 590 nm) from the red phosphor 210A. It does not overlap with the range to be.
[0022]
For this reason, in the lighting fixture using this light-emitting diode lamp A, insects do not respond, and it cannot be attracted.
[0023]
【The invention's effect】
A light emitting diode lamp according to the present invention includes a light emitting diode chip that emits green light, and a red phosphor that emits fluorescence having a wavelength of about 580 to 620 nm in response to light from the light emitting diode chip. The phosphors are Y ₃ (Al, Ga) ₅ O ₁₂ : Eu, Y ₂ O: Eu, Y ₂ O ₃ : Eu, Y (Al, Ga) O ₃ : Eu, (Y, La) ₂ O ₃ : At least one of Eu is selected so as not to emit light having a wavelength of 300 nm to 400 nm or light having a wavelength of 480 nm to 520 nm.
[0024]
The light emitting diode lamp, green is the color that is used as a road sign, is excellent yellow, red, blue, the six colors color identification of the white and orange. In addition, there is a feature that there is no insecticidal property.
[0025]
Further, when the red phosphor is contained in a transparent filter and this filter is embedded in a mold resin for molding the light emitting diode chip, a normal epoxy resin can be used as it is as the mold resin. There is an effect.
[0026]
On the other hand, since the lighting fixture according to the present invention uses the above-described light emitting diode lamp, it does not emit light having a wavelength of 300 nm to 400 nm or a wavelength of 480 nm to 520 nm to which insects are sensitive. There is no irritating property that attracts species. For this reason, there is an effect that insect damage does not occur even when used in street lamps, food-related storefronts, and workplaces. In addition, there are no problems such as a decrease in lamp efficiency and relighting such as a high-pressure sodium lamp, and there is an effect that color discrimination is excellent.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a configuration of a light-emitting diode lamp according to an embodiment of the present invention.
FIG. 2 is a spectrum diagram showing an excitation spectrum of a red phosphor used in the light emitting diode lamp according to the embodiment of the present invention.
FIG. 3 is a spectrum diagram showing an emission spectrum of a red phosphor used in the light emitting diode lamp according to the embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view showing a configuration of a light-emitting diode lamp according to another embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view of a lighting fixture according to an embodiment of the present invention.
[Explanation of symbols]
A Light-emitting diode lamp 100A Light-emitting diode chip 210A Red phosphor

Claims (4)

A light-emitting diode chip that emits green light; and a red phosphor that emits fluorescence having a wavelength of about 580 to 620 nm in response to light from the light-emitting diode chip. The red phosphor is Y ₃ (Al , Ga) ₅ O ₁₂ : Eu, Y ₂ O: Eu, Y ₂ O ₃ : Eu, Y (Al, Ga) O ₃ : Eu, (Y, La) ₂ O ₃ : Eu at least one of them. And a light emitting diode lamp characterized by not emitting light having a wavelength of 300 nm to 400 nm or light having a wavelength of 480 nm to 520 nm .   2. The light emitting diode lamp according to claim 1, wherein the red phosphor is mixed in a mold resin for molding a light emitting diode chip.   2. The light emitting diode lamp according to claim 1, wherein the red phosphor is contained in a transparent filter, and the filter is embedded in a mold resin for molding the light emitting diode chip.   A light fixture using the light-emitting diode lamp according to claim 1, 2 or 3.

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